Electric motor and other apparatus in which there is magnetic flux.



PATENTED APR. 30, 1907v HIGH THERE IS MAGNETIC MEBSHQL ANB OTHERAERATUSN FLUX., APPLIGA'MGH Mmm 14, w04.

ELECTRIC MOTOR RBNEWED 4JAN. 28, 1907.

2 SHEETS-SHEET 2,

` im w,

vwhich the following is a Mwith drum windings.

No. 852,028. y

pplicaton liled March .T0 all whom, t may concern.:

Beit known that l', RALPH D; Maestros', a citizen bf the 'United States,residing at 'New York, in the coun ty and State of New lfoll, haveinvented ce ain-new and usclul linproveme'nts in Electric Mot-ors andother i\. pparatus in Which There is Magnetic Fl 'i I speciiication, rence being had to the drawings accompany ing and forming part of thesame.

The present invention relates to el ectri motors, generators and also toother electrical apparatus in which a magnetic flux occurs between theelements thereof across one or more air gaps, and has lor Vide a m'otoror other machine of the kind mentioned. which shall have a large fluxsurface, or area of air gap, in order to produce a greater magnetic fluxfor the same magnetizing current.

The invention itself, which consists in the novel' features andcombinations hereinafter described and more articularly set -forth inthe' claims, is applica ile to all classes of alter nating or directcurrent motorsv and generators, also, as before state-d, to anyelectrical apparatus in which there is a magnetic flux across an airgap, whether the elements Une thereof are relatively movable or not.instance where they are both stationary is that of a polyphasetransformer. 'lhe description here given will therefore, for the salieof simplicit`v and brevity, be confined to the consideration of theinvention as einbodied in an alternating current induction motor orgenerator..

Referring now to the drawings, Figure l is section showingdiagrarnniatically a motor or generator as ordinarily constructed, withrel:- erence to the air gap between the elements. Fig. 2 is a plan viewel the same, illustrating typical ring windings, as generally employedFigs 3, 4. and 'are sections of machines em bodying the presentinvention. Figs. (5 and 7 are views showing the location of poles andpath of flux for diliercnt connections in the y riinary or excitingelement of a machine cniliodying the present'invention and provided itsobject to pro- Specification of .Letters Patent.

v n j cheaply applied lug. u is a sectional view showing a machine of aform similar to that of ltlg. 5, but provided with windings,

Fig S) is a'section on line lX-lX, showing the short-circuitedsecondary.

ln the usual form of an induction motor,

il OFFCE.

THERE lS MAGNETZC FLUX.

Patented April so, 1907.

190e. Renewed January 28, 1907. Serial No. 3541.538.

typically illustrated by Fig. l, at least one ol' the elements, as 3p,has an exciting winding, producing a magnetic flux' between the adjacentsurfaces a, t. The otherelement may likewise have a windingl Usually thewinding ci one of the elements is of the 6o drinn type, but either orboth may have windings the ring type, as indicated, for example, at c,Fig. i?, preferably laid in slots` d. lt will new be seen that, althoughyhe magnetic lield produced in the primaryf riervades the whole sectionof the ring, the linx between the two elements occurs onl between thesurfaces a and Z). In order to A provide a greater area for theinterchange of flux between the two elements and thereb i 7o reduce theresistance of the magnetic circuit by-increasin'g the area of 'the airgap, I pro.. pose'to inciose, preferably as far as possible, `oneelement by the other, as for example inclosing or surrounding theprimary by the 17,15 secondary. ln Fig. 3 is shown a simpl?" way ofe'ecting this, the primary element being indicated by p and thesecondary b s. ln this instance the former issurrouncl ed by the latteron three sides, so that the 8 flux occurs not only between the surfacesg, g, but also between j, f and between c, c, thus producing a greatertotal magnetic ilu): the saine magneto-motive force. The same resultsmay be secured by the 8: term shown in Fig. 4, in which the innersurface and two sides of one are inclosed-b \,v

the other element. ln each of these cases the linx between the twoelements is, disregarding the magnetic resistance of the iron 9o portionof the magnetic circuit, which in general will be small until saturationis reached, three tinies that in the mahine of Fig. i. Conversely,furthe same total iiuX in each case, the magnetizing current of Figs. 3and 4 will be only one. third that ol Fig. 1. The saine is in generaltrue when drum windings are used, but the comparison between thedillerent forms will then be less favorable in some respects for Figs. 3and Ll, since drum Ico windings are in general not so. easily or tothethree surfaces as to one. But with the ring form we may ofcourseconsider that identically the same windin The forms bffFi'gs. 10:, 2Sand 4; present a difficulty (which, howfever, is

not insuperable), when used in alternating current apparatus, in thematter of lahlinat`` former "muy inngihni tangle lthe to creased nimo lund 9 iff, shown what i consider nom@ admin Toons foi-in ol' thoinvonlion.

lha inner nlninn; l is rectangular in' Section, is shown, to novum :iconsideralilo nii' gzip nrw N lel'oro Lxplnined. The iloinvni' itself i4vli'iiinitod, :1nd has n ring winding luid in slots, as shown, Theouter Qin/mithas two favos adjuvant to the sidas of the iing, nachpiofidod with slots, piol'oinlily i'iidinlly :ii-ranged, in which nreonducloiyconneotod :it their ends to short- Cifcniti* iings l Euch facethcicl'ore onsititutos zbshoit ciionitod clement :malogon lo fnoijvlindiicnl Voiin lanon/'n :is u un c in the clunns, however, l

' li nl" th siiincfm@ which. carries the two face windings as theelement, und descrihciit ',olui'nlitY of wound inves, though,

icly speaking, the two Yo dinlincln elements Awhen Conoieffricilly. Thisoxplznn'ition zipA "o to the l'orins shown. in the other n whivh 'theouer structure muy be, QS?. considorwl to bo two elements, j cmiusclsd,whvn lhc faces are i Alpin-fito and distinct windhnvii 'i in? me in' 'ilLlnini is: i in :in clocliwl up mmflns, the o1nbinlion willi uitminulin' e @inou of polygonal Manlio-n, 'wiinlings on ilu opposiio plane"l he elennniv, and nimm-s lor feeding ,iionl in vuiinnl'n lo lh@windings lio produwy pulci; in ihn sanno relativo posil'ions'in of in:innulzn' olvnwnt having :L {Ulf-wes nni'aillvl :indA udjnccnt ,n oi"the oth'ei'n, a5 svt: l'oi'lh. n nn sli., iO-(il upi'nn'nlu, tho voxnlif :i un :innuhn n minuit olI polygonal voilou lnifiing; n, i'in, 7inding o1' windmill in Slob; therein, of :in annular Olen having @iiiluizilil'y' ol" inves adjacent the, :i n@ munirsi' of Hul'zufw on tholiis. element, in; not forth.

Y. in oleei'iuil up'gnnfilfns, the combinmion wnn :in :annular elementof polygonal ci ,ociion hsufin;y ai ring; winding' oi` winding@ heid in:sioni thm-nin, ol im annular eloff inl having; n plurality of limonadjacent the sinn@ ininilnnini surfaces on ihn first (elementziiifl`lin'v'iii uy Winding; oi' windings luid in loin in lnid faces,:is so@ l'oith` mi. elvctiicnl annu-1111s, tho uomhif nn'ion with :inannular Ollfnwnly ol polygonal @foss isiir'tion having :i ring' windingor Wind.- ings luid in slotzr lihvniin, o" im annular olennin` having :iplurality' ol" lnms adjacent the simio nun'il or of surfaces on bholixst element .and having shoiv-i'ircnited windings luid in nlor: insaid fnvo, nfs sot l'mlvh.

f3. 'in :in oloctriinl zippninusilio combith un annular clment ofrectangu- A-sv'rtion having a ring Winding or lnid in alom vhuioiinof anannular IDO number of surfaces 0n the first element and number ofsurfaces on the Erst element and having windings laid in slots in saidfaces, as havin short-ciieuited windings laid 'in slots m set fo'th. 1 la i h b in sai faces, as set forth.

6. n an e ectrica a aratus, t e 'com iv nation with an annularpglementof rectangu- I; y RALE'JH D' VIESHGN' lar cross section having aringwinding or l Witnesses z' windings laid in slots therein, of anannular lvl. LAWSON DYER, element having two faces adjacent the same SSDUNHAM.

